Wilsonville (OR) Weather & Climate: Best Time to Visit

In Wilsonville, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 28°C (82°F) in August. In December, the coolest month of the year, temperatures drop to a chilly 8°C (46°F).

At night, temperatures range from around 13°C (55°F) in August to 2°C (36°F) in December.

Check out our detailed temperature page for more information.

Temperature ranges by month

Wilsonville experiences significant rain/snowfall throughout the year, averaging 1090 mm (43 in) of precipitation annually. Wilsonville can be quite wet during December, receiving approximately 181 mm (7.1 in) of precipitation over 20 rainy days.

In contrast, during the driest month (August), you will experience much drier conditions, with 10 mm (0.4 in) of precipitation spread across 3 rainy days. For more details, please visit our Wilsonville Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Wilsonville can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 11.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.1 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Wilsonville.

The city experiences its highest humidity in December, reaching 83%. In July, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year